Thanks nealtw and slownsteady. The vapor does appear on the backside of the plastic. So it seems to come from the outside. Do you think that maybe I should open that area and let it dry out? Is this a common occurrence?

Thanks nealtw and slownsteady. The vapor does appear on the backside of the plastic. So it seems to come from the outside. Do you think that maybe I should open that area and let it dry out? Is this a common occurrence?

Water does not usually leak thru solid concrete but it will wick thru it from cold to warm.